Pany op baltimoee city



(No Model.) v

' G. W. HIOKM-AN 8v J. F. McGOY.

INGANDESGEN'I' ELECTRIC LAMP.

No.302,133. f Patented Ju'1y15l1884;

WITNESSES PATENT OFFICE...

GEORGE w. HIcKMAN, OF WASHINGTON, D. 0., AND JOSEPH F. MocoY,oF

RAHWAY, N. J.,. ASSIGNORS TO THE VIADUOT MANUFACTURING COM- P NY OF BALTIMORE 011w, or BALTIMORE, MD.

" INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 302,133, dated July 15, 1884;. Application filed November 7, 1883. (No model.)

To all whom, it may concern;

of Washington, District of Columbia, and J SEPH F. McGoY, of Rahway, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Electric Lamps; and we do hereby declare that the following is a full, clear, and exact description of the invention, which will .enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the leti ters of reference marked thereon, which form part of this specification.

Our invention relates to means for supporting the bulbs of incandescent electric lamps, and to devices for closing and breaking the circuit through incandescing electric lamps for the purpose of lighting and extinguishing the same; and it consists in certain novel constructions and combinations of devices, which will be fully understood from the following particular description, in connection with the accompanying drawings, in which Figure 1 is a side elevation of anincandescing electric lamp, with its base-cup shown in central vertical section, and provided with circuit closing and breaking devices according to our invention. Fig. 2 is a detached view in elevation of the base-cup, the thumbpin being shown in section. tial perspective view of the base-cup, showing its interior grooved wall. tive view of the inclined cam-plates and a por- 3 5 tion of the thumb-pin. Fig. 5 is a horizontal sectionof the lamp on line as w of Fig. 1.

The lamp-bulb A is formed with a downwardly-projecting closed cylindrical extension, a, having one of the leading-in wires, 1?,

o sealed through its lower end wall, and terminating in a concavo-convex metallic tip, m, which is fitted to the end of the extension to with its convex surfacedownward. The other leading-in wire, N, is sealed through the side 5 wall of the extension a, and terminates in a similar tip, m. Within the bulb the wires are held in position by a light glass tube, Z,

which surrounds them both. The extension to is inserted into an approximately-hemi- I spherical cup, 0, which is itself inclosed by a Be it known thatwe, GEO. W. HIOKMAN,

Fig. 3 is a par Fig. 4 is a perspecsimilarly-shaped metal casing, D, having at its lower end a centrally-bored projecting neck, d. The cup 0 has also an opening in its lower end, into which is inserted a metal plug, 6, with which one of the service-wires sis connected, passing up through the neck (1 for this purpose. The upper end of the plug 0 is made concave to form a closely-fitting seatfor the tip on, which rests upon it, while the main body of the bulb rests upon the upper edge of cup 0.; The vertical wall of extension a is separated from that of cup ,0 by an interveningfspace. v

Opposite the tipm, on the side of the extension c, a recess; is formed in the inner surface of cup 0, and is separated by a thin wall, 1", from a recess, t, of greater diameter, formed in the outer surface of said cup.

Through an opening in the wall 1" is arrangeda pin, F, having a thumb-piece, f, by which it may be turned, and radial pins 1) b, which stand within the recess t in front of two inclined or bevel-faced cam-plates, g g, which are fixed to the inner wall of said recess, in opposite sides of the opening therein. Each of 7 these cam-plates has a transverse groove across its face atits thick end. 4

The pin F has formed at its inner end a head, h, the outer surface of which is made concave to fit snugly against the tip m, and behind this head ahelical spring is arranged about the pin with one end bearing against the head and the other against the wall 1". The tendency of this spring is to force the head of the pin in contact with the tip m, and in order to withdraw the head from such contact the pin F is to be turned in proper direction to cause its pins 2) I) to ride up the inclined faces of the camplates 9 g. This will obviously force the pin F outward and compress the spring, and when the pins b b lodge in the grooves across the 'cam-platesthe pin F will hold in the position to which it has been turned. When it is turned back sufficiently to release the pins from the grooves, the spring will force the head back in contact with the tip. The service-wires s 8 pass up through the neck d, and thence wire 8' runsthrou h a passa e formed in a 1D the wall of cup to the head of pin F, to which it is attached, so that when said head contacts with tip m the lamp-circuit will be completed from wire 8 through the head of pin F, tip m, wire N, the incandescing filament I, wire I, tip on, and plug 0, to wire 8.

The thumb-piece f of the pin F should be made of non-conductingmaterial suchashard rubber, glass, or porcelainin order to avoid IO danger of shock to persons manipulating said In order to provide for readily securing the bulb in and removing it from its base-cup, I form on the extensiona two diametrically-opposite studs, 1) 12, while in theinner surface of the cup I out two longitudinal grooves from the edge inward, and extend them laterally at right angles at a little distance from their outer ends, as shown at w. The grooves are so formed and located as to co-operate with the studs 12 v, to form a double bayonet-j oint for securing the bulb and cup together, the inner ends of the grooves terminating at pointsto allow the bulb to be turned to proper position to bring the tip m directly opposite the inner end of pin F.

Having now fully described our invention and explained the operation thereof, what we claim is- 1. In an inca-ndescing lamp, the combination, with the bulb having one of its leadingin wires terminating in a contact-tip on the outside of said bulb, of the circuit closer or breaker carrying a correspondingly-shaped tip connected to the service-wire, substantially as shown and described.

2. The combination, with the incandescinglamp bulb having extension a and its leadingin wires terminating in metal tips m and m on the outer surface of said extension, of the cup 0, metal plug 0, forming a seat for tip on, the pin F, having a head arranged to contact with tip m, the spring arranged to force the pin F inwardly, and suitable means to enable the pin to be forced outwardly and latched, sub stantially as set forth.

3. The combination, with the pin F,arranged to move endwisc, the spring arranged to force said pin in one direction, and the cam-plates and pins 1) b, for forcing the pin in the opposite direction when tnrned, of the incandeso cent-lamp bulb having a contact-plate with which said pin F will make contact for closing circuit when drii en inwardly, substantially as described.

4. The combination, with the bulb having extension (I, provided with the tip m, and studs 0; 'u, of the cup having the circuit closing and breaking pin F, as described, and provided with bayonet-joint grooves to receive the said studs and prevent the turning of the bulb to bring the said tip opposite the inner end of the closing and breaking pin, substantially as described.

In testimony that we claim the foregoing as our own we affix our signatures in presence of two witnesses.

GEO. W. HIOKMAN. JOSEPH F. MCCOY.

Vitnesses:

B. F. MoRsELL, EDWARD E. ELLIs. 

